hestiacp/web/templates/includes/app-footer.php

<footer class="app-footer">
	<div class="container">
		<p>
			<a href="https://hestiacp.com/" class="app-footer-link" target="_blank">
				Hestia Control Panel
			</a>
			v<?= $_SESSION["VERSION"] ?>
		</p>
	</div>
</footer>